Light projector or similar article



J. LEVY 2,114,963

LIGHT PROJECTOR OR SIMILAR ARTICLE Filed Nov. 25, 1935 2 Sheets-Sheet 1 INVENTOR JOSPH LEI/V ATTORNEY Aprii 19, 193%. LEVY v 2,114,963

LIGHT PROJECTOR OR SIMILAR ARTICLE Filed NOV. 25, 1955 2 Sheets-Sheet 2 INVENTOR JOSEPH 16V) W Earth ATTORNEY Patented Apr. 19, 1938 UNITED STATES PATENT OFFICE I LIGHT PROJECTOR R SIMILAR ARTICLE Application November 25, 1935, Serial No. 51,371

Claims.

This invention relates tolighting apparatus and more particularly is directed to spot and floodlight projectors such as used for indoor, stage, display and photographic purposes and for outdoor illumination requiring long or short beam focusing adjustments.

Among objects of the invention is the provision of an improved spot and flood-light pro-- jector construction of the character described, which shall'comprise a few and simple parts that are readily assembled to form a neat-appearing, compact apparatus which shall be easy to manipulate and adjust, and which shall be inexpensive to manufacture, and practical and efiicient to a high degree in use.

Other objects of this invention will in part be obvious and in part hereinafter pointed out.

Certain features herein shown and described, are shown, described and claimed in my applica- 20 tion filed, October 25, 1934, Serial No. 749,877, now Patent No. 2,076,240, issued April 6, 1937 for a spot and flood-light projector apparatus of which the present application is a continuation in part. i

The invention "accordingly consists in the features of construction, combinations of elements and arrangement of parts which will be exemplified in the constructions hereinafter described and' of which the scope of application will be indicated in the following claims.

In the accompanying drawings, in which is shown various possible illustrative embodiments of this invention:

Fig. 1 is a side elevational view, in longitudinal section, of a spot and flood-light apparatus embodying the invention.

Fig. 2.is a top plan view of the improved apparatus.

Figs. 3, 4 and 5', arecross-sectional views taken on lines 33, 4-4 and 5-5 in Fig. 1, respectively.

Fig. 6 is a side elevational view showing the hinged parts of the housing swung open to give access to the reflector and incandescent lamp.

Fig. '7 is a fragmentary view of the fitting surrounding the lamp receptacle showing the skirted portion thereof formed with the bayonet connecting part and Fig. 8 is a front elevational view of a diaphragm plate having a circular opening, in Fig. 4 there" being shown in dot and dash lines another such diaphragm plate with a square opening position in the slideway.

Referring in detail to the drawings, l0 indicates generally an incandescent-lamp type spot 55 and flood-light projector embodying the invention constructed to permit adjustment for long or short beam focusing in indoor and outdoor illumination services.

The apparatus I0, is seen to comprise an outer tubular body casing or hood I preferably formed with a stamped sheet or cast metal head portion I la provided with an upper wall member 30, said portion Ila and wall member 30 being firmly secured together by any suitable means, such as bolts l2. An ellipsoidal reflector I3 is fitted within the hood II and may be secured in place by screws I4 which rigidly hold the peripherial flange Bit of the reflector l3 against an abutment ring l5, the latter being fastened to a mid-portion of the portion ||a by screws 16. A mid-section of the reflector l3 and the rear curved portion of the head portion I la may be cut to provide openings I31) and Nb, respectively, in register, for the free passage therethrough of the bulb end ila of an incandescent lamp l1. Said lamp has its contact or base end |'|b fitted into a receptacle or socket I8 and through flexible cable wires l9 connects with a suitable electric power source (not shown) in the well understood manner.

The receptacle l8 may be fixedly secured on a saddle piece 20 to project beyondthe upper end 2|a of a cylindrical fitting 2|, said receptacle l8 extending through said fitting 2| and down beyond the lower end 2|b of the-latter, as shown in Fig. 1. The fitting 2| may be of a cast or moulded material with a skirted portion having an outwardly extending flange 2|c which is located to permit entering the end 2lb of said fitting 2| into an opening a provided in the upper wall member 30 for rigidly seating said flange 2 la therein whereby the receptacle l8 with the lamp I1 is firmly positioned in proper cooperation with the inner side of I30 of the reflector l3.

To positively retain the fitting 2| in its seated position, a suitable locking means is provided in the form of a bayonet type connection 22 and a releasable fastening 23 constructed and arranged in a right-angle relation.

A cap 26 is fitted as a cover over the upper end 2|a of the fitting 2|, said cap being spaced from the saddle member 20 and firmly retained in position by suitable means, such as screws 21. The cap 26 is provided with perforations or top openings 26a to permit the passage of air through the fitting 2| for cooling the lamp l1 and socket Ill. The cap 26 as seen from Fig. 1, does not embrace the cylindrioal fitting 2|, but is spaced therefrom to provide an annular air passage as at 28.

The connection 22 is provided by a hook portion 21d extending from said fitting 2i into the opening 30a of the wall member 30 for engaging with a screw 24 which projects into opening 30a. The fastening 23 and said connection 22 are positioned in diametrically opposite relation, said connection 22 including an open-end slotted lug 23a extending outwardly from the flange Me for engaging with the clamping bolt 25 which is threaded into the member 30. See Figs. 1, 2 and 6.

on opposite sides of the housing ll, below the wall member 30, a pair of spaced handled spindles 32 may be screwed into bossed plates 33 for trunnioning the projector ill on a suitable support (not shown) in the well understood manner. The bossed plate 33 is secured to the head portion Ila by any suitable means such as bolts 34.

The head portion ii a, on an underside thereof at a spaced distance from the upper wall portion 30, has an inlet lib which communicates the space on the rear of the reflector i3 in the interior of the hood II with the atmosphere.

Besides the air outlet provided through and under the cap 26, the wall member 30 is formed with the passageway 30b, which occupies a substantial portion of the upper side of the housing i I. Said passageway 30b is fitted with a baflie plate or louver 29 held by screws 3|, said plate preferably being formed of a corrugated sheet for deflecting the air passing from the hood II as shown in Figs. 1 and 5.

The head portion iia under the baflie plate or louver 29 may be provided with openings lie to permit air circulating between the reflector l 3 and said portion lia to pass therethrough around the plate 29 and out of the housing ii.

The hood II has an extension cylindrical light tube 35, which is preferably made of sheet metal and has its inner end 350. forming a lap joint 40 with a connecting ring piece 36, the latter being hinged at 31 to the head portion Ila on the end of the hood ii for receiving the light beams from the reflector l3 and the lamp bulb lie. The connecting ring piece 36 may be made of casting to provide suflicient rigidity and strength to take care of the stresses and strains due to the swinging movement of tube 35 on the hinge 31 as shown in Fig. 6. The tube 35 and ring piece 36 may be retained from separating at the lap joint by the bolt 38 said piece having an abutment flange 360 for contacting with the hood ii.

The projector l0 maybe provided with a simple form of shutter for controlling the shape and spread of the light beam. In the construction here shown, a support 39 is mounted within the ring piece 36, said support is carried by spaced inwardly projecting ribs 36a formed integral with the ring piece 36 and located under the joint 40. Said support 39 includes a slideway 39a for receiving one of a set of diaphragm plates 42 which has a desired shaped and sized opening 42a. Said plate 42, when inserted through a slot 36b provided in the ring piece 36 is interposed in the path of the light beams from the lamp l1 and the reflector l3, as is clear from Figs. 1, 2 and 4.

The slideway 39a has a shield plate 3% spaced therefrom, which, with the support 39 blocks the light beams from passing, except through the center openings 39c and 39d of said support 39 and plate 39b, respectively. The opening 39c is adapted to be covered to a desired degree, by the diaphragm plate 42 when seated in the slideway 33a in the well understood manner.

The light tube 35 carries at its outer or front end a lens holder 43 which has'fitted therein :1

pair of spaced lenses 44 and 45. The lens 44 abuts an outwardly extending flange 46a of a spacer collar 46, and lens 45 is held in position against an inwardly extending flange 43a of the holder 43. The entire lens assembly is held in place by a spring snap ring 41 which fits between the lens 44 and a suitable stop, such as spaced protuberances 48. For adjusting the lenses 44 and 45 to focus the projected light, said lens holder 43 I carrying said lenses is made to telescope in tube 35. A suitable engagement means for limiting the movement of said holder 43 relative to the tube 35 is provided, as for example, the pin and slot adjustable connection comprising the screw 48a. secured to the collar 46 extending up through a slot 35c provided at the front end 35b of the tube 35, said screw having a flnger nut 48a for clamping the movable parts in adjusted positions. Additional air inlet holes 35d in the tube 35 may be provided inward of the lens holder 43.

If desired, a color screen support 49 may be carried on the front end of the collar 43 as shown in Figs. 1, 2 and 6.

For securing the tube 35 in effective closed position, as shown in Figs. 1 and 2, a latch 50 is provided. Said latch 50 comprises a block 50a carrying on threaded shank 5017 on which a finger nut 50c is screw-adjusted. Said block 50a is mounted for swing moving on a bracket 50d which is fastened in a suitable manner to the member 30 as by bolts 50c. An open-ended slotted piece 5i carried by the ring 36 is provided for receiving the shank 50b therein, the finger nut 500 being adapted to be adjusted to clamp against said piece 5| for locking andsecuring the tube 35 to the hood ii.

The operation of the improved apparatus ill will now be apparent. After constructing apparatus ill from an assembly of parts described above and shown in the drawings, the cable wire i9 is'connected to a suitable power source (not shown) in the well understood manner.

The lamp l! is lit on the application of power to the wires l9 and the light beams from the lamp fllament and that reflected from the inner surface l3a of the reflector l3 will be projected through the hood H and the tube 35, and will pass from the lens 44 for use to illuminate a desired place or object. The heat generated around the lamp base ilb and at the socket l8 will be carried off partly by air passing through the fitting 2i and out from the cap 26, and partly by air passing around'the base llb of said lamp H and out through the louver 29 in passageway 30b, cooling air entering the hood ll through inlets ilb. Heat generated at the lamp bulb Ila and within the reflector l3 will be carried off, by air entering the hood i I from the tube 35, circulating around said bulb I10, and passing through the reflector opening l3b to the rear of the reflector l3, then passing through hood openings lie and hence out of the louver 29. Thus two relatively short air cooling paths are provided for carrying off the heat generated whereby the temperature of the apparatus l 0 is kept at a minimum.

Should the reflector l3 or the lamp ll, require inspection, the latch 50-is released and the tube 35 may be swung on the hinge 37, as shown in Fig; 6, giving free access to the reflector l3 and lamp i'l'.

To remove the lamp IT for replacement the fastening 23 and connection 22 may be released and fitting ill with the lamp l1 detached.

-With the diaphragm plate 42 removed, the opening 390 of the support 39 gives the maximum circular beam cross-section. Smaller size or difierent shaped beam cross-sections may be obtained by inserting correspondingly shaped diaphragm plates d2 through the slot 3% into the slideway 39a of support 39.

The projected light beam may be focused by simply adjusting the lens holder 43 by looseningthe finger nut 48aand movably sliding said holder $3 with the lenses 44 and 45 in the tube 35 toward or away from the reflector i8 and lamp I].

It will thus be seen that there is provided a device in which the several objects of this invention are achieved and which is adapted to meet the conditions of practical use.

As various other possible embodiments might be made of the .above invention and as various changes might be made in the embodiments set forth, it is to be understood that all matter herein set forth as shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense. I

Having thus described my invention I claim as new and desire to secure by Letters Patent:

1. In a lightproiectin g apparatus construction of the character described, a hood having an upper wall member, a reflector fitted into said hood with an air passage between the rear side of the reflector and the inner side of the hood, a lamp mounted with a filament portion of the bulb thereof extending through the reflector, said reflectorjand hood having a through opening-of sufficient size to permit the lamp bulb to freely pass therethrough for removably supporting the lamp on said member with a portion of the lamp bulb extending behind said rear side of the reflector, and a lens carrying tube hinged to swing from said hood at the front side of the reflector. said hood having upper and lower spaced openings communicating with said air passage to permit the fiow of cooling air around the lamp base, the lamp bulb portions and through said air passage, said member having a bamed outlet adjacent said upper hood opening for the circulating air The light-projecting apparatus construction defined in claim 1 in which a secondbaflied outlet is provided adjacent the lamp base for'the circulating air.

3. In a light-projecting apparatus construction of the character described, a hood having an. upper wall member serving as part of the exterior side thereof, a reflector fitted into said hood with an air passage between the rear side of the reflector and hood having a through opening topermit a lamp bulb to freely pass therethrough for removably supporting the lamp on said member with a portion of the lamp bulb extending be- Y and through said air passage, said member havingspaced baiiied outlets for the circulating air, said tube having openings to permit the circulating of cooling air about the lamp bulb portion at the front side of the reflector and through said outlets. a

4. In a light-projecting apparatus construction of the character described a hood having an upper wall member serving as part of the exterior side thereof, said member formed with an opening for seating a lamp receptacle fitting and with an air outlet spaced from and alongside said opening, a louver, therim. of said outlet being formed to retain said louver, a reflector fitted in the hood with an air passage between the rear side of'the reflector and the inner side of the hood, said refiector being located directly under said member and outlet louver, said louveroutlet communicating with said passage, and locking means for releasably securing the fitting in said position in said opening whereby said receptacle fitting together with the lamp receptacle fitting may be readily dismounted from the member.

5. In a light-projecting apparatus construction of 'the'character described having a hood and a lens system, a tube hinged to swing from said hood for adjustably carrying said lens system, said hinged tube including a ring-piece end formed with an abutment flange portion serving as a coupling joint with the hood on swinging the tube in alignment on the hinge, and a diaphragm plate support mounted within said ring piece at a spaced distance from the lens system, said ringpiece having a slot communicating said support with the exterior of the apparatus for inserting and removing diaphragm plates to vary the crosssection of lightbeams projected through the tube fromsaid hood before passing through the lens system, said hinged tube when swung out of said alignment giving free access to the interior of the hood. JOSEPH LEVY; 

